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Original Articles

The risk of tinnitus following occupational noise exposure in workers with hearing loss or normal hearing

, , , , &
Pages 109-114 | Received 22 Mar 2007, Published online: 07 Jul 2009
 

Abstract

The purpose was to investigate the relationship between noise exposure and tinnitus among workers with normal hearing and hearing loss, respectively. We conducted a cross-sectional survey of 752 workers employed at 91 workplaces, that were investigated by means of full work-shift noise levels, questionnaire data, and bilateral pure-tone audiometry. Tinnitus was not associated with the present noise level, the duration of noise exposure, or the cumulative noise exposure if participants had normal hearing. As expected, such trends were demonstrated if participants had a hearing handicap. Based on these data, we will be cautious in ascribing tinnitus to noise exposure in our patients’ workplaces if they have a normal audiogram. Furthermore our data indicates no risk of noise-induced tinnitus at exposure levels where no hearing loss would be expected, e.g. as usually encountered in non-industrial workplaces.

Abbreviations
LAeq,t=

A-weighted equivalent noise level

dB=

Decibel

OR=

Odds ratio

95%CI=

95% confidence interval

Abbreviations
LAeq,t=

A-weighted equivalent noise level

dB=

Decibel

OR=

Odds ratio

95%CI=

95% confidence interval

Sumario

El objetivo fue investigar la relación entre la exposición a ruido y el acúfeno en trabajadores con audición normal y con hipoacusia, respectivamente. Realizamos una encuesta transversal en 752 trabajadores empleados en 91 lugares de trabajo que se investigaron con base en los niveles de ruido en sus turnos, en datos del cuestionario y en la audiometría tonal bilateral. El acúfeno no se asoció con el nivel de ruido de ese momento, la duración de la exposición al ruido o la exposición acumulada al ruido cuando los participantes eran normoyentes. Como se esperaba, tales tendencias se demostraron si los participantes presentaban una hipoacusia. Con base en estos datos, seremos cautelosos en atribuir el acúfeno a la exposición a ruido del lugar de trabajo de nuestros pacientes si tenían un audiograma normal. Incluso nuestros datos indican que no es de esperar la presencia de acúfeno en lugares de trabajo en los que por su nivel de ruido no se espera que ocasione hipoacusia, p.ej. lugares de trabajo no industriales.

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